Device for producing artificial silk threads of perfectly uniform cross-sectional shape



prn M, 1936. F. NIN LT 2,037,087

DE E F PRODUGING ART GIAL SILK THREADS OF ERF LY UNIFORM CROSS SECTIONL SHAPE Filed May 27, 1952 Vcontinually positively moved Patented Apr. 14, 1.936

PATENT OFFICE DEVICE FOR PRODUCING ARTIFICIAL SILK THREADS OF PERFECTLY UNIFORM CROSS-SECTIONAL SHAPE Y Fred Ninnelt, Frankfort-on-the-Main, Germany Application May 27, 1932, Serial No. 613,965 In Germany May 29, 1931 9 Claims.

This invention relates to a device for producing artificial silk, in which the eiects of the varying pressure conditions on the individual spinning points are neutralized by interposition of a throttle point in such a manner thatA it is no longer necessary to employ special measuring pumps for obtaining a uniform thread.

It is already known, to employ throttle points instead of artificial silk spinning pumps. They possess with unvariable cross section always the same resistance. For regulating the pressure Vconditions a separate pressure equalizing element is coordinated to the same by means of which the pressure difference is maintained continually constant on both sides of the passage orifice. Uniform pressure with always the same resistance in the throttle point are the features by which these arrangements have to ensure a uniformity of the liquid admission.

Their objections consist in that by the putting in parallel of throttle point and regulating element. the reliable operation of the devices is very detrimentally affected. 'I'he solutions employed for spinning artificial silk have the property of solidifying when aging. Dead points and angles in the conduits which could not be avoided in the known arrangements therefore lead to the formation of scales and consequently to repeated choking of the ne bore of the throttle point. For the same reason the arrangement in the solution of springs and of elements which are not leads to interruptions. Moreover it was not possible with the known devices to vary the titre as desired.

Contrary to the known constructions all damping of the pressure variations is done away with according to the invention, these variations being utilized for obtaining a constant delivering efciency within the throttle point by correspondingly varying the resistances.

Unequalized pressure variations and, controlled by them, corresponding variations offthe coefiicient of flow of the throttle point are the characteristic novel feature of the invention, by which an increasing of ythe security of service is obtained by simplified channel guiding with at the same time much simplied construction and an adjustability of the titre is also possible.

A device for carrying out the method according to the invention is illustrated by way of example in the accompanying drawing. Inlet and discharge conduits for the solution are constructed like the openings in the ordinary spinning pumps and the dimensions are so selected, that the device according to the invention can be used instead of the usual pumps in the ordinary pump bridges. l

In the drawing:

Fig. 1 shows the feed regulating device in longitudinal section. 5

Fig. 2 is a side elevation of Fig. 1.

Fig. 3 shows a modiiied form of construction in longitudinal section.

I designates the casing of the device, 1- the inlet port and 6 the feed conduit to the regulating compartment 5 corresponding to the regulating compartment 4 on the delivery side, 3 being the delivery conduit and 2 the discharge port of the device. 'I'he regulating compartments 4 and 5 intercommunicate by a bore 8 which forms the throttle point in conjunction with a cylindrical screw threaded element 9. Thek screw threaded element 9 has a spindle I 0 rigidly connected on its ends with diaphragms II, I2 made of rubber or other suitable material and serving for closing the regulating compartments4 and 5. The spindle I is journaled outside the spinning liquid in bearings I3 and I4. The ends of the spindle are screw threaded so that nuts I and I 6 can be screwed thereon to limit the movement of the spindle. The bearing I4 comprises a spring I1, the tension of which can be regulated by means of a screw I8. The bearings I3 and I4 further have ventilation holes I9 in such position that they register with slots in the ends of the spindle, so that the spindle and the bearings can be simultaneously turned by means of a suitable tool for eiiecting the ne adjustment. n

Fig. 3 illustrates a modified construction of the device. A sleeve 2| in the bore 8 which connects the regulating compartments 4 and 5 is screw threadedkon a portion of its circumference and shiftable in longitudinal direction. 'I'he shifting is eiiected by means of a knurled nut 22. For preventing the sleeve from turning a pin 23 is iixed in the casing and projects into a groove 24 of the sleeve. The sleeve serves for accommodating a cylindrical slidable body 25 which has in its upper surface a groove 26 extending in axial 5 direction and tapering in cone shape. The throttle point proper is formed by the discharged point of this groove 26 by the left end of the sleeve 2I. The effect of the throttle point varies according to the position of the slide and sleeve, 50 owing to the varying cross section of the groove 26. Mushroom-shaped extensions 21 of the slidable body bear at both ends against the diaphragms, The positive connection is established by plates 28 which are guided in the interior of. 5

2 the bearings I3 and I4 and pressed against the diaphragms by adjustable springs I1 and 29.

The device according to Fig. l operates in the following mannen- The spinning solution passes from the inlet port 1 through the feed conduit 6 to the regulating compartment 5, ows through the channel formed by the screw thread in thebore and leaves the distributing device through the regulating compartment 4, the delivery conduit 3 and discharge port 2.

The quantity of spinning liquid delivered is determined substantially by the pressure difference between the two regulating compartments, that is between the main conduit and the point of consumption, upon the size of the passage openings, in the example illustrated the free cross section of the screw thread, and upon the loss by friction during passing through the throttle point, in this instance upon the number of screw threads through which the liquid must flow. Fluctuations in pressure are equalized according to the invention in that an alteration of the pressure difference is positively followed byv a corresponding alteration of the resistance to iiow, that is in the example in question an alteration of the number of screw threads along which the liquid must flow. This is attained in the following manner:

After the dimension of the device has been chosen according to the effect which it is desired to attain, a ineadjustment is carried out by bringing the screw threaded element 9 together with the spindle III into a position in the bore 8 corresponding to the normal pressure difference by simultaneously turning the two bearings I3 and I4. If a pressure increase occurs on the delivery side, the increase pressure exerted upon the diaphragm I2 causes shifting of the screw threaded element towards the delivery side, so that for equalizing the reduced pressure difierence by correspondingly reducing the number of screw threads to be traversed, the resistance at the throttle point is also reduced. In a similar manner a pressure increase in the main conduit causes shifting of the screw threaded element towards the feed side and consequently increase of resistance. In any case an alteration of the pressure difference is neutralized by correspondingly altered now conditions, so that the uniformity of supply is always maintained. The spring I1 serves for neutralizing the excess pressure resulting on the supply side with diaphragms of uniform size.

It is evident that other forms of construction of the automatical feed regulating device upon which the Amethod is based may be employed, in that for example the resistance at the throttle point is maintained constant and instead thereof the cross section is made automatically adjustable according to the variations in pressure, for example asin the construction illustrated in Fig. 3, which enables besides a convenient ne adjust- 'ment by turning the knurled nut, or by combinations of the two arrangements, or by other suitable throttling devices. Instead of the diaphragms, which present the advantage that the spinning liquid can be kept away from the bearing points and the springs and at the same time prevent air from penetrating into the device,.pis tons may be provided for initiating the regulating movement. The fine adjustment may be facilitated by gauze marks on the screw connections of the knurled nut or by arranging the throttle visible in a glass tube constructed as a window.

When the pressure in the main conduit is found to be too high for a favourable conversion in the feed regulating device, a reduction thereof can be previously effected by fitting in the shutting off element for the feed regulating device a throttle point which is not vaffected by the regulation. Moreover, the new method of distributing the spinning solution can be employed without influencing its effect anywhere where the detrimental influences of pressure regulations have already been reduced by the arrangement of pressure regulating devices on the different spinning machines.

I claim:-

l. A device for regulating the supply of the spinning solution to a spinning nozzle to be inserted instead of t .-e usual spinning pumps for the production of artificial threads between the supply conduits for the spinning liquid and the spinning nozzles, comprising in combination two chambers the one communicating with the supply conduit for the spinning liquid and the other communicating with the conduit for the spinning liquid leading to the nozzle, a passage connecting said two chambers, a movable element adapted to change by its movement the free total ow capacity of this passage, means influenced by the liquid pressure in said two chambers adapted to produce at the action of the difference of the liquid pressures in these chambers a movement of the element regulating the free passage total ow capacity in that sense that by corresponding en larging of the free total flo-w capacity of the passage with decreasing pressure diiference and by corresponding reducing capacity of the passage at increasing pressure difference the quantity of the spinning liquid flowing in the time unit to the nozzle is maintained constant. Y j

2. A device for regulating the supply of the spinning solution to a spinning nozzle to be inserted instead of the usual spinning pumps for the production of artificial threads between the supply conduits for the spinning liquid andthe spinning nozzles, comprising in combination two chambers the one communicating with the supply conduit for the spinning liquid and the other communicating with the conduit for the spinning liquid leading to the nozzle, a passage connecting said two chambers, a movable element adapted to change by its movement the free total flow capacity of this passage, diaphragms of elastic yieldable material submitted on one side to the liquid pressure one in each of said chambers, elements adapted to transmit the movement of said diaphragms caused by the alteration of the liquid pressure in said chambers upon the element destined to change the free total ow capacity of the passage between the two liquid chambers.

, 3. A device for regulating the supply of the spinning solution to a spinning nozzle to be .inserted instead of the usual spinning pumps for the production of artificial threads between the supply conduits for the spinning liquid and the spinning nozzles, comprising in combination two chambers the-one communicating with the supply conduitfor the spinning liquid and the other communicating with the conduit for the spinning liquid leading to the nozzle, a passage connecting said two chambers, a movable element adapted to change by its movement the free total flow capacity of this passage, diaphragme of elastic yieldable material submitted on one side to the liquid pressure one in each of said chamof the free total flow` bers, elements adapted to transmit the movement of said diaphragms caused by the alteration of the liquid pressure in said chambers upon the element destined to change the free total iiow capacity of the passage between the two liquid chambers, at least the chamber communicating With the supply conduit for the spinning liquid being provided with a spring adapted to act upon the outer side of said diaphragm in opposite direction as the liquid pressure.

4. A device for regulating the supply of the spinning solution to a spinning nozzle to be inserted instead of the usual spinning pumps for the production of artificial threads between the supply conduits for the spinning liquid and the spinning nozzles, comprising in combination two chambers the one communicating with the supply conduit for the spinning liquid and the other communicating with the conduit for the spinning liquid leading to the nozzle, a passage connecting said two chambers, a movable element adapted to change by its movement the free total ilow capacity of this passage, pistons one in each of said chambers submitted on one side to the action of the liquid pressure and slidable in a guide, elements adapted to transmit the movements of the said pistons caused by the changing of the liquid pressures in said spaces upon the element arranged between the two liquid chambers for changing the free total flow capacity of said passage.

5. A device for regulating the supply of the spinning solution to a spinning nozzle to be inserted instead of the usual spinning pumps for the production of articial threads between the supply conduits for the spinning liquid and the spinning nozzles, comprising in combination two chambers the one communicating with the supply conduit for the spinning liquid and the other communicating with the conduit for the spinning liquid leading to the nozzle, a passage connecting said two chambers, a movable element adapted to change by its movement the free total flow capacity of this passage in a certain sense, means influenced by the liquid pressure in said two chambers adapted to produce under the action of the diierence of the liquid pressures in these chambers a movement of the element regulating the free total flow capacity of said passage in that sense that by according enlarging of the free cross section of the passage at the decreasing pressure difference and by corresponding reduction of the free cross section of said passage at increasing pressure difference the quantity of the spinning liquid flowing to the nozzle in the time unit is maintained constant, and elements adapted to enable the adjusting of the element regulating the free total ow capacity of the passage between said two liquid chambers into the position corresponding to the desired normal free total flow capacity of the passage at normal pressure diierence.

6. A device as specied in claim l, comprising a casing having a cylindrical bore, a piston in and shorter than said bore having on its surface a narrow channel for the passage of the liquid extending in axial direction and tapering in cone shape, and means for shifting said piston in said bore in the event of the Variations in pressure difference at the two ends of said bore, to regulate the quantity of liquid owing through said channel.

7. A device as specified in claim 1, comprising a casing having a cylindrical bore, a piston in said bore having on its surface a narrow channel of Varying cross section for the passage of the liquid adapted to 'be shifted in said bore by the Variations in pressure diiTerence at the two ends of said bore to regulate the quantity of liquid n flowing through said channel.

8. A device as specified in claim 1, comprising in combination a casing having a bore, diaphragms of rubber in the bore in said casing adapted to be actuated by the pressure, an element adapted to be shifted by said diaphragms to Vary the quantity of liquid owing through the device, and bearings for said element outside of said diaphragm out of the range of the liquid passing through the device.

9. A device as specified in claim l, comprising in combination a casing, a throttling element in said casing adapted to be actuated by Variations in pressure between the main conduit and the places of use, and means for effecting the fine adjustment of said element without affecting the automatic regulation thereof.

FRED NIN'NELT. 

